Last Modified: 05-13-2024 6.11:8.1.0 Doc ID: RM10000000255UH
Model Year Start: 2023 Model: GR Corolla Prod Date Range: [09/2022 -           ]
Title: G16E-GTS (ENGINE CONTROL): SFI SYSTEM: P166014; Air Intake Control Valve Circuit Short to Ground or Open; 2023 - 2025 MY GR Corolla [09/2022 -        ]

DTC

P166014

Air Intake Control Valve Circuit Short to Ground or Open

DESCRIPTION

The air cleaner is equipped with two inlets, one of which is opened or closed by the Air Intake Control Valve (AICV). This system reduces intake noise and increases engine power at low-to-high engine speed range. When the engine is operating in the low-to-mid speed range, this control operates the AICV to close one of the air cleaner inlets. When the engine speed is more than 3600 rpm, the ECM activates VSV and opens the AICV.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Note

P166014

Air Intake Control Valve Circuit Short to Ground or Open

Voltage of terminal air intake control valve of the ECM is low when the VSV is not operating for 3 seconds or more (1 trip detection logic).

  • Open or short in vacuum switching valve assembly (for AICV) circuit
  • Vacuum switching valve assembly (for AICV)
  • ECM

Does not come on

SAE Code: P1660

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

Inspect the fuses for circuits related to this system before performing the following procedure.

HINT:

Read Freeze Frame Data using the GTS. The ECM records vehicle and driving condition information as Freeze Frame Data the moment a DTC is stored. When troubleshooting, Freeze Frame Data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air fuel ratio was lean or rich, and other data from the time the malfunction occurred.

PROCEDURE

1.

PERFORM ACTIVE TEST USING GTS (ACTIVATE THE VSV FOR AICS)

*1

Air

*2

Port E

*3

Port F

*4

Air Filter

*a

Vacuum Switching Valve is On

*b

Vacuum Switching Valve is Off

(a) Disconnect the vacuum hose (port F) from the vacuum switching valve assembly (for AICV).

(b) Enter the following menus.

Powertrain > Engine > Active Test

Tester Display

Activate the VSV for AICS

(c) Check the operation of the vacuum switching valve assembly (for AICV) when the vacuum switching valve assembly (for AICV) is operated using the GTS.

Standard:

GTS Connection

Specified Condition

ON

Air from port E flows out through port F

OFF

Air from port E flows out through the air filter

OK

CHECK FOR INTERMITTENT PROBLEMS

NG

2.

INSPECT VACUUM SWITCHING VALVE ASSEMBLY (FOR AICV)

Click here 2023 - 2025 MY GR Corolla [09/2022 -        ]; G16E-GTS (INTAKE / EXHAUST): INTAKE SYSTEM: ON-VEHICLE INSPECTION+

NG

REPLACE VACUUM SWITCHING VALVE ASSEMBLY (FOR AICV)

OK

3.

CHECK TERMINAL VOLTAGE (POWER SOURCE OF VACUUM SWITCHING VALVE ASSEMBLY (FOR AICV))

(a) Disconnect the vacuum switching valve assembly (for AICV) connector.

(b) Turn the ignition switch to ON.

(c) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

C137-2(+B) - Body ground

Ignition switch ON

11 to 14 V

*a

Front view of wire harness connector

(to Vacuum Switching Valve Assembly (for AICV))

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR (NO. 1 INTEGRATION RELAY - VACUUM SWITCHING VALVE)

OK

4.

CHECK HARNESS AND CONNECTOR (VACUUM SWITCHING VALVE ASSEMBLY (FOR AICV) - ECM)

(a) Disconnect the vacuum switching valve assembly (for AICV) connector.

(b) Disconnect the ECM connector.

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

C137-1(AIRV) - C142-49(AICV)

Always

Below 1 Ω

C137-1(AIRV) or C142-49(AICV) - Body ground

Always

10 kΩ or higher

OK

REPLACE ECM 2023 MY GR Corolla [09/2022 - 11/2022]; G16E-GTS (ENGINE CONTROL): ECM: REMOVAL 2023 - 2025 MY GR Corolla [11/2022 -        ]; G16E-GTS (ENGINE CONTROL): ECM: REMOVAL

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR